台风对工厂化虾池生态系统中COD的影响

根据2003年7月台风发生期间工厂化虾池生态系中的实测数据,重点分析了不同养成密度虾池生态系中COD的变化状况及其影响因素。结果表明:台风气候对虾池生态系中COD的影响较大,台风发生时COD含量相对较高,台风前后相对较低;台风气候对COD周日变化的影响以养成密度大的养殖池较为显著,养成密度小的养殖池则影响较小;COD与环境因子之间的相关性差异也较大,台风前,养成密度大的养殖池与NO2-呈显著正相关(r=0.668),与T和Chl.a呈负相关关系(r=-0.608或r=-0.633);台风后与PO4-P、NH4+和Chl.a之间则表现的显著正相关(r=0.907、0.832、0.846)。而养成密度低的养殖池,台风前COD与pH呈显著负相关(r=-0.732),台风后与PO4-P和NO2-分别呈显著正相关(r=0.720)和良好正相关(r=0.591)。但在台风发生时,二池均无此类相关性出现。

Effect of Tyhpoon on COD in Shrimp Pond for Industrialized Cultivation in the Ecological System

Based on the measured statistics to the ecological system of the shrimp pond of industrialized cultivation during the typhoon period in July,2003,we particularly studied and analyzed the status of the change of COD and its effected factors on the ecological systems of different density of the shrimp pond.The results showed that typhoon weather effected the content of COD in the ecological system of the shrimp pond more.Whatever density was,the content of COD was relatively high in typhoon period and low before or after typhoon.The influence was marked in dense cultured pond,but less in the low density pond.The relativity between COD and environmental factors was quite different.Before typhoon,the dense pond had remarkable positive relativity with NO-2~-(r=0.668) while had fine negative relativity with T and Chl.a(r=(-0.608) or r=-0.633);After typhoon,it had better remarkable positive relativity with PO-4-P、NH-4~+ and Chl.a(r=0.907,0.832,0.846).For the low density pond,it only had marked negative relativity with pH(r=-0.732) before typhoon.After typhoon,it only had marked(r=0.720) and better(r=0.591) positive relativity separately with PO-4-P and NO-2~-.But there was no relativity for both ponds during typhoon period.